Load holding valve

Details Load holding valve Load holding valve

1998-07-23

1999-12-07

Hepperle, Stephen M.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

137110, 1374939, F15B 1301

Patent

active

059964669

ABSTRACT:
In a load holding valve L, comprising a check valve R and a pressure limiting valve D in a housing chamber which is common to said two valves, a seat insert 13 has provided therein a valve seat 19 for a closure member 4 of the pressure-limiting valve D and a sealing surface 15 for a check-valve closure member 16, and an opening piston 9, which is coupled to the closure member 4, is provided in a pilot chamber 10, an effective area of said closure member 4 being, in a direction opposite to the direction of spring loading, adapted to be acted upon by the pressure to be limited, the opening piston 9 is formed integrally with the closure member 4 and is provided with a pressure surface in the pilot chamber 10 which is slightly smaller than the cross-sectional area of the valve seat 19, and the valve seat 19 defines in combination with control passages K formed in the closure member 4 a stroke-dependent quantity control device M.

REFERENCES:
patent: 1765627 (1930-06-01), Stacy
patent: 4172582 (1979-10-01), Bobnar
patent: 4223693 (1980-09-01), Kosarzecki
patent: 4727792 (1988-03-01), Haussler
patent: 5133434 (1992-07-01), Kikushima et al.

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